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Description of Excorallana yamamuroae sp. nov., (Crustacea, Isopoda) preliminary record of the genus in Japan

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Description of Excorallana yamamuroae sp.

nov., (Crustacea, Isopoda) preliminary record of the genus in Japan

journal or

publication title

Bulletin of the Toyama Science Museum

number 12

page range 13‑17

year 1988‑10‑31

URL http://repo.tsm.toyama.toyama.jp/?action=repos itory̲uri&item̲id=558

(2)

BulletinoftheToyamaScienceMuseumNo12,pp1317(1988

DescriptionofExcoγαα"αα"lα"呪oaespnov.Crustacea,Isopod preliminaryrecordofthegenusinJapan*

A

NoboruNunomura ToyamaScienceMuseum

日本近海から初めて報告されたキバウオノエ属(甲殻類:等脚目)の一新種、

E節 、脆"αvα池α脚"わ の記載

布 村 昇 富山市科学文化センター

鹿児島県上甑島の汽水湖、貝池から発見された戯 7〃んγzα属(甲殻類、等脚目)を新種 Er "tz? yα加α班況γ0 (和名:ヒメキバウオノエ)として記載した。本種はアメリカ太 平洋岸バハ・カリフォルニアから知られているEカブ 畑"α〃α〃 ノi(ze(Menzies)と最も類似 するが、(1)腹尾節側方のくぼみの欠如、(2)体の後方の剛毛の欠如、(3)第一触角の 第一節が著しく肥厚していること、(4)腹部の代わりに胸部後半の背板に突起が有ること 等で区別される。本種はまた、西インド諸島から知られているE虻CO 伽"as"6"/"sとも類 似するが、(1)オス胸部背板に突起が有ること、(2)腹尾節が後端が丸いこと、(3)目 が比較的小さいこと、(4)胸部基板が、より顕著であること、(5)第一触角鞭数が多い

こと等によって区別される。

newspeciesofisopodbelongingtotheflabelliferanfamilyCorallanidaeishere edfromthebrackishwateroftheLakeKai‑ike,Kami‑koshikilslands,Kagoshima

describedfromthebrackishwaterottheLaKe腿al‑lKe,瓜aml‑KosnlKllslanus,nagusllluld

ken,Kyushu,westemJapan・

IwishtoexpressmyheartythankstoDr,MasumiYamamuro,theUniversityofTokyo

forherkindnessincollectingsuchinterestingspeclmens.

GenusExcoγα〃α〃αStebbing

(Japname:Kiba‑uonoe‑zoku,new)

ThismaybethefirstrecordofthegenusECO"ααfromJapananditsneiboring

ExcoFα〃α〃αJamαm〃γOaEsp.、0V.,

(Japanesename:Hime‑kibauonoe,new)

Figs12

Mz"γ E、 " :1罰(holotype,8.6mminbodylength),2早早(l¥allotype,88mm inbodylengthandlparatype,9.4mminbodylength),LakeKaiike,Kamikoshikilsland Kagoshimaken,collMasumiYamamuro,Nov.,l984i2(5.65.9mminbodylength)

*ContributionsfromtheTovamaScienceMLlseum,No.73

1イ〕

1 0

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NoboruNunomul・a

KaiikeAu9.25,1985TypeseriesisdepositedasfollowsHolotypeTOYACr7632) allotype(TOYA‑Cr7633)andaparatype(TOYA‑Cr7634)attheToyamaScienceMuseum aparatype(OMNHAr‑3255)attheOsakaMuseumofNaturalHistory,andaparatype (NSMTCr‑9391)attheNationalScienceMuseum,Tokyo・

Dgscγゆ"0〃:Male‑Bodyoblong,about2.3timesaslongaswideColordullyellow inalcohol・Cephalontrapeozoidalinshapeandbearsapairofprojectionsonanterodorsal part,Eyesratherbig,eachcomposedofabout70ommatidia,PereoniteslV‑VIIsomewhat longerthantheanterioronesEpimeraofpereonitesllVIIdistinctandratherbig PereonitesVandVIIwithapairofratherremarkableprojectionsoneachposteriorpart PereoniteVIwith2pairsofprojectionsonposterodorsalpartPleonitelinvisibleindorsal viewPleonitesllandlalmostequalinlengthPleonitelVexpandedposteriorlyinboth lateralsidesPleoniteVratherlongthananyotherpleonitesandwithalowprojectionsat medialpartPleotelsonalmosttriangularandroundinapicalpartBothramiofuropodas

equallyprotrudedbackwards,

Antennule(Fig.2A),reachingpereonite2,composedofl4segmets,1stsegmentbigand

Fig.1EZY 畑"tz刀αyα郷α加況 sp、nov.,

A,DorasalviewofholotypemaleB,DorsalviewofallotypefemaleCMandible DMaxilluleEMaxillaF,Maxilliped(CFholotypemale)

14

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c,"0Q/ajV助jesQExcorallanayamamuroae〃霊

一 シ 李 一 二

A

︑¥

,

面=

ころ

柵が '/"W 言、

Fig.2EY γtz"α"α 柳α加岬り sp,nov.,

A,Antennule;BAntenna;C‑I、Pereopodsl7;J,Pleopod2inmale;K、Uropod

(All:holotypemale).

almostsquare,

Antenna(Fig2B),reachingtheanterlormarginofthe5thpereonalsomite,peduncular composedof5segmentsandHagellumcomposedof24segments・

Mandible(Fig.1C)withlowcuttingedgepalpwithsegment2morethantwicelonger thanlor3lateralmarginofsegment2with41argeand3moderatelystiffsetae

Maxillulle(Fig.1)outerlobeformingasingle,largeandrecurvedtooth Maxilla(Fig.1E)rectangularwithabigprocess.

1上

(5)

Nobor●uNunomura

Maxilliped(Fig.1F)enditesmallpalp5segmented,1stto4thsegmentssubequali

length;terminalsegmentsmallthantheotherones,

Pereopodsl3(Fig.2CE)basisbigandrectangularischiumsmallandtriangular carpustriangularwith3setaeonmnermarginand34setaeonouterdistalcornercarpus

short;propodusstout、

Pereopods46(Fig.2FH)basisoblongischiumelongatedtriangular,with3groups ofsetaeoninnermargimerusrectangularwith2groupsof3setaeonlnnermargincarpus rectangularwith2groupsof2setaeoninnermarglnpropodusratherlong

Pereopod7(Fi921)basisbigandrectangularischiumlongwith3merusquadrate

carpusrectangular;propoduselongated、

Penesunfortunatelybroken

Pleopod2(Fig.2J)endopodrectangularwithanarrowandlinearstylus,almostaslong

asendopodexopodrectangularbutnarrowerthanendopod

Uropod(Fi9.2K)basistriangularendopoditeovatewithafringedsetaeand9spines aroundthemarginexopoditelanceolatewithmanysetaeand56spinesaroundthemargin FemaleSimilartomalebutwithoutanytuberclesondorsalsurfaceofpereonai

somltes・

RgαsThepresentnewspeciesismostcloselyalliedtoEr?"αだ〃αereported fromBajaCalifomia,NorthAmerica,butthenewspeciesisseparatedfromEαルinthe followingfeatures(1)lackofnotchesoflateralpartofpleotelson2lackofsetaon posteriorhalfofthebody,(3)remarkablystoutlstpedunclarsegmentofanteImuleand(4 presenceoftuberclesontheposteriorhalfofpereonalsomites

ThepresentnewspeciesisalsoaiedtoEス、/""as"6"/(Hansen)reportedfromSt ThomasWestlndiesButthenewspeciesisseparatedfromEs"6"sinthefoowing features(1)presenceoftuberclesonthedorsalsurfacesof5thto7thpereonalsomitesin male,(2)rounderposteriormarginofpleotelson,(3)smallereyes,(4)moreprommenteplmera ofpereonalsomitesand(5)morenumeroussegmentatlonsofHagellaofantennule

References

Bowman,TE1977Isopodcrustaceans(exceptAnthuridae)collectedonthePresidental Cruiseofl938,Proc,Biol・SOC,Wash89:653‑666.

Hansen,H,』.,1905.RevisionoftheEuropeanmarineFormoftheCirolaninaeasubfamilv ofCrustacealsopoda.LinnSOCLondon,3377372.plsxxxiiixxxv

Kussakin,0G.'1979Marineandbrackishwaterlsopodaofthecoldandtemperatewaters oftheNorthernHemisphereSuborderFlabelliferaOpredelitilipoFauneSSSR

l221‑470.(inRussian).

Menzies,RJ1962TheMarineisopodafaunaofBahiadeSanQuintin,BajaCalifomia

Maxico・PacihcNaturalist,3(11):337‑348.

Richardson,H,R1901.KeytotheisopodsofAtlanticcoastofNorthAmericawithdes‐

l

(6)

Dgsc'わ"o q/ajW加助 /gsQ/ExcorallaI'ayamamuroae醜〃 〃

criptionsofnewandlittleknownspecles、Proc、US.Nat.Mus,23:493‑579.

Richardson,H,R、1905.A、onographoflsopodofNorthAmerica・BuⅡU、S,Natl.Mus、

54:1‑727.

Schultz,G,A、1969.Howtoknowthemarineisopod.W、.C,Company・

Thielemann,M1910BeitragezurKenntnisderlsopodenfaunaOstasiens,AbhandlWiss

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Yamamuro,M,1987.MacrobenthicFaunasofTwoBrackishLagoonswithDifferentsali‐

nityinKamikoshikilsland,KagoshimaPrefecture、JapJ,Limnol,48(3)倉177‑186

17

参照